2004ApJ...604L..81G


C.D.S. - SIMBAD4 rel 1.7 - 2020.02.17CET22:40:42

2004ApJ...604L..81G - Astrophys. J., 604, L81-L84 (2004/April-1)

Witnessing the gradual slowdown of powerful extragalactic jets: the X-ray-optical-radio connection.

GEORGANOPOULOS M. and KAZANAS D.

Abstract (from CDS):

A puzzling feature of the Chandra-detected quasar jets is that their X-ray emission decreases faster along the jet than their radio emission, resulting in an outward-increasing radio-to-X-ray ratio. In some sources this behavior is so extreme that the radio emission peak is located clearly downstream of that of the X-rays. This is a rather unanticipated behavior given that the inverse Compton nature of the X-rays and the synchrotron radio emission are attributed to roughly the same electrons of the jet's nonthermal electron distribution. In this Letter we show that this morphological behavior can result from the gradual deceleration of a relativistic flow and that the offsets in peak emission at different wavelengths carry the imprint of this deceleration. This notion is consistent with another recent finding, namely, that the jets feeding the terminal hot spots of powerful radio galaxies and quasars are still relativistic with Lorentz factors Γ∼2-3. The picture of the kinematics of powerful jets emerging from these considerations is that they remain relativistic as they gradually decelerate from kiloparsec scales to the hot spots, where, in a final collision with the intergalactic medium, they slow down rapidly to the subrelativistic velocities of the hot spot advance speed.

Abstract Copyright:

Journal keyword(s): Galaxies: Active - Galaxies: Quasars: General - Radiation Mechanisms: Nonthermal - X-Rays: Galaxies

Simbad objects: 7

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Number of rows : 7

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 QSO J0635-7516 QSO 06 35 46.5080299 -75 16 16.815501   15.96 15.75 15.82   ~ 504 1
2 7C 082754.29+242103.00 QSO 08 30 52.08619070 +24 10 59.8204032   17.62 17.26 16.30   ~ 457 1
3 QSO J1130-1449 QSO 11 30 07.05259287 -14 49 27.3881476   17.17 16.90 16 16.97 ~ 617 1
4 NAME Crt A Sy1 11 39 10.7024704226 -13 50 43.638984127   16.38 16.17 16.4   ~ 240 1
5 3C 273 BLL 12 29 06.6996828061 +02 03 08.598846466   13.05 14.830 14.11   ~ 5275 1
6 ICRF J135704.4+191907 Sy1 13 57 04.43665381 +19 19 07.3724675   16.33 16.03 15.3   ~ 405 3
7 QSO B1508+572 QSO 15 10 02.92236464 +57 02 43.3759071   22.73 21.38 19.23   ~ 150 0

    Equat.    Gal    SGal    Ecl

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2020.02.17-22:40:42

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